Easily assembled ratchet wrench

Abstract

A ratchet wrench includes a wrench main body provided at an end thereof with a through hole, wherein a ratchet wheel is disposed, which is provided from top to bottom thereof in order with an upper ratchet portion, an upper annular groove, a middle ratchet portion, a lower annular groove and a lower ratchet portion. The upper and lower ratchet portions both protrude out of the through hole. The middle ratchet portion is located in the through hole. Two retainers are respectively disposed in the upper and lower annular grooves located out of the through hole, for retaining the ratchet wheel in the through hole. As a result, in the ratchet wrench of the present invention, the wrench main body doesn't need much processing, thereby improved in processing convenience. Besides, the installation of the members is convenient and firm, thereby benefiting the operation of the ratchet wheel.

What is claimed is: 
     
       1. A ratchet wrench comprising:
 a wrench main body which is provided at an end thereof with a through hole penetrating through top and bottom surfaces of the wrench main body and an accommodating room radially communicating with the through hole; 
 a ratchet wheel rotatably disposed in the through hole of the wrench main body and having an upper ratchet portion, a middle ratchet portion, a lower ratchet portion, an upper annular groove and a lower annular groove, the upper ratchet portion and the lower ratchet portion both protruding out of the through hole, the middle ratchet portion being located in the through hole, the upper annular groove being located out of the through hole and located between the upper ratchet portion and the middle ratchet portion, the lower annular groove being located out of the through hole and located between the middle ratchet portion and the lower ratchet portion; the upper ratchet portion, the middle ratchet portion and the lower ratchet portion all having a plurality of ratchet teeth, an upper ratchet teeth surface being jointly defined by tips of the ratchet teeth of the upper ratchet portion, a middle ratchet teeth surface being jointly defined by tips of the ratchet teeth of the middle ratchet portion, a lower ratchet teeth surface being jointly defined by tips of the ratchet teeth of the lower ratchet portion, the upper annular groove having an upper annular surface, the lower annular groove having a lower annular surface, the ratchet wheel being provided with an outer circumferential surface which is only constituted by the upper ratchet teeth surface, the upper annular surface, the middle ratchet teeth surface, the lower annular surface, and the lower ratchet teeth surface in sequence, the upper ratchet teeth surface, the middle ratchet teeth surface, and the lower ratchet teeth surface all having an outer radius in equal, the outer radii of the upper ratchet teeth surface, the middle ratchet teeth surface, and the lower ratchet teeth surface all being larger than an outer radius of the upper annular surface and an outer radius of the lower annular surface; a ratchet block disposed in the accommodating room of the wrench main body and elastically engaged with the middle ratchet portion of the ratchet wheel; and 
 two retainers, one of the retainers being disposed in the upper annular groove of the ratchet wheel, the other retainer being disposed in the lower annular groove of the ratchet wheel. 
 
     
     
       2. The ratchet wrench as claimed in  claim 1 , wherein the through hole has an inner wall, and the inner wall has a smooth surface. 
     
     
       3. The ratchet wrench as claimed in  claim 1 , wherein the upper ratchet portion of the ratchet wheel has a top surface higher than the top surface of the wrench main body, and the lower ratchet portion of the ratchet wheel has a lower surface lower than the bottom surface of the wrench main body.